Rubberized asphalt paving composition and use thereof
AssigneeUnion Oil Company of California
InventorsDonald L. Nielsen, James R. Bagley
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AssigneeUnion Oil Company of California
InventorsDonald L. Nielsen, James R. Bagley
Estimating the term…
The dissolving and/or dispersing of relatively large proportions of reclaimed rubber into molten paving asphalts is facilitated by incorporating into the asphalt a minor proportion of a highly aromatic, high-boiling, high-flash-point mineral oil. The resulting mixtures can be held at temperatures above 300.degree. F for substantial periods of time without becoming too viscous for convenient handling, thereby facilitating the application thereof to roadways. The rubberized asphalt mixtures are particularly useful in the form of stress absorbing membrane interlayers between old, damaged pavement surfaces and an overlayer of new asphalt concrete, for providing chip-seal coatings over old pavement, as crack fillers in Portland Cement concrete or asphalt concrete pavements, and bridge deck waterproofing membranes.
A paving composition comprising a heat-blended, substantially homogeneous composite of (1) from about 50-89 weight-percent of an asphaltic component selected from the class consisting of paving grade asphalts, slow curing liquid asphalts and road oils, (2) between about 10% and 30% by weight of a reclaimed rubber component, about 10-60 weight-percent of said reclaimed rubber component being ground vulcanized natural rubber, and about 15-70 weight-percent thereof being ground devulcanized rubber, and (3) between about 1% and 20% by weight of a mineral oil solvent having a flash point above about 300.degree. F, and containing more than about 50 weight-percent aromatics, at least about 50% of said solvent boiling above 700.degree. F, and at least about 90% thereof boiling above 600.degree. F.
A method for the manufacture of a paving composition which comprises:
Dependencies are inferred from the claim text.